COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

Reheating in a gas turbine

Increases the compressor work

Increases the thermal efficiency

Decreases the thermal efficiency

Increases the turbine work

TRUE ANSWER : ?
YOUR ANSWER : ?

Propulsion efficiency of the following order is obtained in practice

0.5

0.34

0.6

0.72

TRUE ANSWER : ?
YOUR ANSWER : ?

Axial flow compressor has the following advantage over centrifugal compressor

Higher pressure ratio per stage

Larger air handling ability per unit frontal area

Higher average velocities

Aerofoil blades are used

TRUE ANSWER : ?
YOUR ANSWER : ?

Work ratio of a gas turbine may be improved by

Increasing the compression work

Decreasing the compression work

Increasing the turbine work

Both (A) and (C) above

TRUE ANSWER : ?
YOUR ANSWER : ?

Ratio of indicated h.p. to shaft h.p. in known as

Isothermal efficiency

Volumetric efficiency

Compressor efficiency

Mechanical efficiency

TRUE ANSWER : ?
YOUR ANSWER : ?

Gas turbine works on

Ericsson cycle

Carnot cycle

Rankine cycle

Brayton or Atkinson cycle

TRUE ANSWER : ?
YOUR ANSWER : ?

If p₁, is the pressure of air entering the L.P. cylinder and p₂ is the pressure of air leaving the L.P. cylinder (or inter-cooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocating air compressor with complete intercooling is given by (where D₁ = Dia. of L.P. cylinder, and D₂ = Dia. of H.P. cylinder)

D₁/D₂ = p₂/p₁

D₁/D₂ = p₁/p₂

D₁/D₂ = p₁ p₂

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The work ratio of simple gas turbine cycle depends on

Maximum cycle temperature

Minimum cycle temperature

All of these

Pressure ratio

TRUE ANSWER : ?
YOUR ANSWER : ?

In a jet engine, the air-fuel ratio is

2.0840277777778

2.5006944444444

1.6673611111111

1.2506944444444

TRUE ANSWER : ?
YOUR ANSWER : ?

The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio

Decreases

Increases

First decreases and then increases

First increases and then decreases

TRUE ANSWER : ?
YOUR ANSWER : ?

↑